Thousand Oaks Solar Filter 266mm OD


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SKU: S-10750

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After years of R&D we have developed a new solar film that has the optical quality of glass with the advantages of impregnated polymer. Will never develop pinholes or scratches that can let in light and ruin a filter. Other advantages: lightweight and does not require re-balancing tube assembly, will not break, consistent yellow-orange solar image, even density with any aperture, flat surface compared to other thin film filters that have wrinkles and creases. Will not tear or puncture.

What Size Do I Order?

How to Measure Outside DiameterThe size chart below lists sizes by clear aperture (filter size in center of cell) and outside diameter (O.D.) of aluminum cell (inside cell wall that fits over and around telescope tube). The O.D. of our cells needs to be at least 1/16″ larger than the OD of the telescope tube or binocular barrel etc. Choose the closest cell O.D. that is LARGER than the O.D. measurement of your instrument. Example: Part number S-4250 (4 1/4″ O.D.) would fit instrument O.D. measurements from 4″ to 4-3/16″. Do not choose a size the same as your O.D. since it will be too tight. Self adhesive felt is included for custom fitting. If your application requires additional felt; Velcro, felt, and other types of material can be found at most fabric or home improvement stores.



If the solar filter is to be used on an open truss telescope, the open area from front (secondary mirror) to back (primary mirror) must be covered. No direct sunlight should enter the optical path or the concentrated beam from the mirror can focus on the back of the solar filter film and cause damage and void warranty.

40mm1.50″ 50mm2.00″ S-2000
45mm1.75″ 60mm2.32″ S-2325
50mm2.00″ 70mm2.75″ S-2750
60mm2.37″ 76mm3.00″ S-3000
60mm2.37″ 82mm3.25 S-3250
80mm3.15″ 90mm3.50″ S-3500
80mm3.15″ 95mm3.75″ S-3750
80mm3.15″ 101mm4.00″ S-4000
90mm3.50″ 108mm4.25″ S-4250
101mm4.00″ 114mm4.50″ S-4500
101mm4.00″ 120mm4.75″ S-4750
101mm4.00″ 127mm5.00″ S-5000
101mm4.00″ 133mm5.25″ S-5250
114mm4.50″ 139mm5.50″ S-5500
127mm5.00″ 146mm5.75″ S-5750
127mm5.00″ 152mm6.00″ S-6000
127mm5.00″ 158mm6.25″ S-6250
127mm5.00″ 165mm6.50″ S-6500
152mm6.00″ 181mm7.12″ S-7125
152mm6.00″ 190mm7.50″ S-7500
152mm6.00″ 203mm8.00″ S-8000
177mm7.00″ 212mm8.37″ S-8375
177mm7.00″ 222mm8.75″ S-8750
203mm8.00″ 236mm9.312″ S-9187
203mm8.00″ 241mm9.50″ S-9500
203mm8.00″ 247mm9.75″ S-9750
203mm8.00″ 254mm10.00″ S-10000
203mm8.00″ 266mm10.50″ S-10500
228mm9.00″ 273mm10.75″ S-10750
254mm10.00″ 292mm11.50″ S-11500
254mm10.00″ 305mm12.00″ S-12000
254mm10.00″ 311mm12.25″ S-12225
279mm11.00″ 317mm12.50″ S-12500
254mm10.00″ 330mm13.00″ S-13000
304mm12.00″ 349mm13.75″ S-13750
317mm12.50″ 387mm15.25″ S-15250
355mm14.00″ 406mm16.00″ S-16000
355mm14.00″ 432mm17.00″ S-17000
355mm14.00″ 447mm17.625″ S-17625

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